OKLAHOMA CITY (AP) — Authorities in Oklahoma County have launched an investigation into the death of an inmate.

The Oklahoma County Sheriff's Office said Tuesday that 63-year-old Richard Holt died at an Oklahoma City hospital on Saturday. Authorities say Holt had been transported to the hospital to receive treatment for a preexisting medical condition when he died.

Sheriff's detectives are conducting the investigation, and the cause of Holt's death will be determined by the Office of the State Medical Examiner. The findings of the investigation will be turned over to prosecutors to determine whether criminal charges are warranted.

Oklahoma City police officers booked Holt into the Oklahoma County Jail on March 20 on a complaint of making a bomb threat.